Allow the adaptive evaluation with fmeasure or positions

according to sample or only experts
Refactor positions in Evaluation to be boolean and go until position 100 and Implement the Evaluation of different topic models

+ little Refactorings
Implement stop words in Massoudi
Fix the ranking of topic based search results to remove duplicate tweets
Make the number of topics we forget in future topic models dependent on the number of topics
Print the number of tweets that were already indexed with url content
Strong refactoring to implement a new ranking score for topic-based search
Evaluator: Add experiments on the query expansion and fix the score to improve the topic based search
Print additional information in topic model construction for dynamic topic models
Update the list of URLs that lead to Out of Memory Error